Pipe-threading machine.



No. 686,577. Patented Nov. I2, I90]. 8. BURDEN.

PIPE THREADING MACHINE.

(Application filed Dec.' 11, 1900.)

(No Model.)

3 vwemtoz attorney UNrrED STATES PATENT OEErcE.

BRADFORD BORDEN,'OF WVARREN, OHIO.

PIPE-'THREADING MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 686,577, dated November 12, 1 901.

Application filed December 11, 1900- Serial No. 39,489. (No model.) i

To a whom, it may concern:

Be it known that I, BRADFORD BoRD N, of Warren, in the county offlrumbull and State of Ohio, have invented certain new and useful Improvements in Pipe-Threading Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to pipe-threading machines.

The objects of the invention are, first, to provide a machine of this character capable of being used wherever required without the necessity of securing it to a base or any support other than that derived from the pipe to be threaded; second, to construct a machine which shall'be simple in construction and capable of easy operation, and, third, one Wherein the operations of the driving-gear and the cutting mechanism are rendered accurate and efiective.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a perspective. Figs. 2 and 3 are opposite end views. Fig; 4 is a vertical sectional View with the parts separated.

Referring to the drawings, 1 designates the leader feed-screw, composed of a tubular portion 2, having throughout a portion of its length a male thread 3.

4 is a frame having a ring or circular portion 5, removably held on the enlarged end of the feed-screw, and an overhanging portion 7, wherein is located an elongated driving-pinion 8, the shaft 9 of which is fitted in openings in the parallel portions of said overhanging portion 7. A crank-handle is designed to be applied to the outer end of this shaft. Through the ring 5 and the feed-screw are passed bolts 10, by which a pipe is firmly clamped after its insertion in the tubular portion of the feed-screw, saidbolts serving the double purpose of clamping frame 4 upon the end ofthe feed-scre'wand holdingapipe within the latter.

12 designates a large gear-wheel having a female thread 13 for engaging the thread of the feed-screw, said gear-wheel being in mesh with the pinion 8. Integral with an enlarged cylindrical portion 14, carried by and projecting from wheel 12, is a housing 15 of polygonal formationin vertical section. In this housing is the die-block 16, the exterior contour of which con forms to that of the interior of the housing. In this way the die-block rotates with the housing and the gear-wheel. The cutting-dies 17 project inwardly from the die-block. The latter is inclosed within the housing by a keeper-plate 18, pivoted at 19 and provided with a hook 20, which engages with and is held by a thumb-screw 21 at a point opposite the pivot of the keeper-plate.

In practice the pipe to be threaded is inserted'through the tubular portion of the feedscrew until its forward end enters between and isheld by the bite of the dies 17, after which the bolts 10 are screwed in to hold the feed-screw upon the pipe and the frame at upon the feed-screw. The pinion Sis rotated by the crank-handle or othersuitable means, imparting a'rotary motion to the wheel 12. The length of the pinion being greater than the width of the gear-wheel, the latter as it is being rotated is permitted to move lengthwise as it works on the thread of the feed-screw. The rotation of the gear-wheel and the housing effects the turning of the die-block, and the dies of the latter cut a thread on the pipe corresponding to the pitch of the thread of the feed-screw and the coacting female thread of the gear-wheel.

It is obvious that a device constructed in accordance with my invention possesses many advantages. The clamping mechanism insures the accurate positioning of the pipe, and any slant thereof will cause the frame and feed-screw to assume the same position. Furthermore, no support for the machine other than that afforded by the pipe itself is necessary.

I claim as my invention- 1. Apipe-threading machinecomprisingan externally-threaded feed-screw, a frame removably mounted thereon having an overhanging portion, a gear-pinion'journaled in said overhanging portion, a gear-wheel having an internal screw-thread designed to coact with the thread of the feed-screw, said gear-wheel meshing with said pinion, a dieblock carried by said gear-wheel, and means for uniting said frame and feed-screw and clamping a pipe in the latter, substantially as set forth.

2. In a pipe-threading machine, a feed- 5 screw externally threaded throughout a portion of its length, a removable frame having a circular portion surrounding said feedscrew, means for securing said frame and holding a pipe within the feed-screw, an overro hanging portion on said frame, a gear-pinion in said overhanging portion, a gearwheel having an internal screw-thread designed to coaot with the thread of the feed-screw, said gear-wheel meshing with said pinion, and a I 5 die-block carried by said gear-wheel, substan tially as set forth.

8. Apipe-threading machinecoinprisingan externally-threaded feed-screw, a removable frame having a circular portion surrounding 20 said feed-screw formed with openings coinci- BRADFORD BORDEN.

Witnesses:

FRANK S. CHRYS'I, E. L. KING. 

